1. (n.) A ball or globe forming part of the regalia of an emperor or other sovereign. It is encircled with bands, enriched with precious stones, and surmounted with a cross; -- called also globe.

2. (n.) An artificial hill or elevation of earth; a raised bank; an embankment thrown up for defense; a bulwark; a rampart; also, a natural elevation appearing as if thrown up artificially; a regular and isolated hill, hillock, or knoll.

3. (v. t.) To fortify or enclose with a mound.

abatis advanced work anthill arch arch dam backstop balistraria bamboo curtain bank bank up banquette bar barbed-wire entanglement barbican barrage barricade barrier barrow bartizan bastion battlement bear-trap dam beaver dam boom boundary stone brae brass breakwater breastwork brick wall buffer bulkhead bulwark bust butte cairn casemate cenotaph cheval-de-frise circumvallation cock cofferdam column contravallation counterscarp cromlech cross cup curtain cyclolith dam defense demibastion dike ditch dolmen down drawbridge drift drumlin dune earthwork elevation embankment enclosure entanglement escarp escarpment fell fence fieldwork foothills footstone fortalice fortification gate glacis grave gravestone gravity dam groin haycock haymow hayrick haystack headstone heap heap up hill hillock hoarstone hummock hump hydraulic-fill dam inscription iron curtain jam jetty kitchen midden knob knoll leaping weir levee logjam loophole lunette machicolation mantelet marker mass mausoleum megalith memento memorial memorial arch memorial column memorial statue memorial stone menhir merlon milldam moat mole molehill monolith monticle monticule monument moor mountain mow necrology obelisk obituary outwork palisade parados parapet pile pile up pillar plaque portcullis postern gate prize pyramid rampart ravelin redan redoubt reliquary remembrance ribbon rick rise roadblock rock-fill dam rostral column sally port sand dune scarp sconce seawall shaft shock shrine shutter dam slope snowdrift stack stack up stela stockade stone stone wall stupa swell tablet tell tenaille testimonial tomb tombstone tope tor trophy tumulus vallation vallum wall weir wicket dam work